# How are significant figures determined if a number is expressed in scientific notation?

##### 1 Answer

Jul 15, 2017

The same rules (see below) apply whether a number is expressed in long form or in scientific notation.

#### Explanation:

Rules for significant figures:

1. Non-zero digits are ALWAYS significant

2. Zeroes between other significant figures are significant

3. Significant figures begin with the left-most non-zero digit

4. The rightmost digit (of a decimal number – one with an expressed decimal point) is significant (even if it is a zero)

5. If there is no decimal point then the right-most non-zero digit is the least significant digit